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BQ51013B, LTC4065, MCP1700 Schematic and PCB layout completed.
02/23/2015 at 14:43 • 1 comment
U4 BQ51013B - Wireless Power Receiver (for wireless charging). bq51013a.lbr
U5 LTC4065 - Complete Linear BatteryCharger in 2mm × 2mm DFN Package. LTC4065L.lbr
originally was MCP7331 in SOT23
U6 MCP1700 - Linear Voltage Regulator with 1.6 µA Quiescent Current in 2mm × 2mm DFN Package. MCP1700.lbr
originally was TLV70033 with 31 µA Quiescent Current in SOT23
Latest Schematic and PCB layout you can find on GitHub.
Thank you for your support! I quit my day job to spend more time for B10N1C.
PN532 schematic and PCB layout completed. ATMEGA328, LED bar graph, EMG pads placed.
10/26/2014 at 01:55 • 0 comments

RC522 replaced on PN532.
Y4 - 27.12MHz Crystal from Murata, Crystal-Murata-XRCGB27M120F3M00R0.lbr
Trace width 8mil, via drill 10mil & via diameter 20mil.
nRF8001 schematic and PCB layout completed
10/13/2014 at 19:00 • 0 comments

Y1 - 16MHz Crystal with build in capacitors (the same like on Arduino Pro Mini), SparkFun-FreqCtrl.lbr
Y2 - Super tiny 32.768 kHz crystal, Crystal-ABS05-32.768KHZ-9-T.lbr
0402 package size for all resistor and capacitors
Improvement for NRF8001 circuit
10/12/2014 at 02:51 • 0 comments

Johanson 2450BM14A0002 balun (U2) + Johanson 2450AT18A100 chip antenna (U3) = smaller PCB area for NRF8001 circuit & smaller BOM.
BALUN with NRF8001 reference schematic
Johanson 2450BM14A0002 balun Eagle library
Johanson 2450AT18A100 chip antenna Eagle library
Done with breadboard prototyping
09/29/2014 at 03:39 • 3 comments

Last 3 electronic components was tested with whole system.
HTU21D - humidity and high precision temperature sensor in one IC
MMA8451 - Triple-Axis Accelerometer w/ 14-bit ADC
nRF8001 - Bluetooth Low Energy IC with SPI interface
From tomorrow I'm starting PCB design in Eagle. I'm gonna keep you updated about PCB progress as well.
NEW Solution for Arduino Wireless Reset
09/29/2014 at 02:31 • 0 comments

I spent so much time trying to figure out how to wirelessly reset the Arduino, which is a requirement for uploading code to the processor.
I came up with a new solution for the wireless reset: On the programmer side, I have a powerful electromagnet connected through a power transistor to a RTS pin on a FTDI adapter. On B10N1C PCB I have a Hall effect sensor connected to a reset pin. HM 10/11 stays in design.
The electromagnet must be located close to the skin in order to accomplish the uploading code.
I have already a prototype for testing.
Saving RFID tag into i2c memory
09/29/2014 at 00:30 • 0 comments

RFID Reader/writer IC: http://www.nxp.com/documents/data_sheet/MFRC522.pdf
Arduino code from my video: https://github.com/txyzinfo/B10N1C/tree/master/Arduino%20Code/RFID_to_memory_test
Сode depends on the library: https://github.com/miguelbalboa/rfid
Using EMG circuit as EMF sensor
09/28/2014 at 18:41 • 0 comments
EMG and LED Bar Graph test
09/28/2014 at 11:41 • 1 comment

Super Bright 0603 LED from Vishay http://www.digikey.com/product-detail/en/VLMW1300-GS08/VLMW1300-GS08CT-ND/2813370
How EMG circuit works you can find here https://github.com/txyzinfo/B10N1C/blob/master/Reference%20schematics/BITalino%20EMG%20schematic.pdf
HM-10 / HM-11 Bluetooth communication and Arduino remote reset
09/09/2014 at 14:55 • 0 comments